JP2010045910A - Fireproof processing member for wiring box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fireproof processing member for a wiring box capable of reliably preventing spreading of fire to a flexible cable conduit and a connector therefor when a fire outbreaks, without affecting a construction technique nor a step of installing a switch, a receptacle, and the like. <P>SOLUTION: The fireproof processing member for a wiring box includes a holding member which includes a claw part attached to the outside end of the wiring box, a holding member which has a predetermined strength and has a cross section of a predetermined width in U-shape (polygonal or circular depending on attaching object), and a fire refractory material of thermal expansion property arranged inside the holding member. The holding member includes a body whose cross section is almost U-shaped, a bending part formed at one end of the body, and the claw part extended from the bending part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fireproofing member for a wiring box for preventing the spread of fire from a wiring box used for indoor wiring in the event of a fire.

  The outlets and switches that are installed inside buildings use many plastic parts, and in the event of a fire, there is a risk of melting, deformation, or burning due to the heat. As a result, heat and flame flow into the wiring box. In the wiring box, there is an electric wire (flammable long object) drawn in to connect to a switch or an outlet, and the electric wire (flammable long object) and its coating are burned, so that the electric wire becomes like a conducting wire. It plays a role and may transmit flames and heat from the inside of the hollow wall or through the wall penetration of the electric wire to the adjacent room, etc., which may spread the fire.

  In order to prevent this, a refractory material for a wiring box in which a heat-foamable refractory material is pasted on the inner surface or outer surface of the wiring box has been disclosed (Japanese Patent No. 2945272). When a heat-foaming refractory material is attached to the inner surface of the wiring box, the space inside the wiring box is compressed, and wiring work inside becomes difficult. In addition, when a heat-foamable refractory material is attached to the outer surface of the wiring box, the expansion direction of the heat-foamable refractory material is directed to the external space, so that the expected fireproof performance may not be obtained.

  Japanese Patent Application Laid-Open No. 2003-41683 discloses a fire resistance method for a wiring box. FIG. 15 is a diagram for explaining a fireproofing method for a wiring box disclosed in Japanese Patent Application Laid-Open No. 2003-41683. As shown in FIG. 15, the wiring box 116 is covered with a sheet-like heat-resistant sealing material 128 having an endothermic action instead of a heat-expandable refractory material. This method closes the gaps between the holes and slits of the wiring box and the front surface of the wiring box 116 and the inner surface around the opening 118, so that the heat in the wiring box 116 is transmitted to the outside even if a fire enters the wiring box 116. prevent. However, according to this method, it is possible to prevent the transmission of heat and delay the spread of fire, but it has spread to the resin-made flexible conduit connector 124 and the flexible conduit 122 attached to the wiring box 116. In some cases, there was a possibility that the spread of fire could not be stopped.

Furthermore, Japanese Patent Application Laid-Open No. 2007-14045 discloses a fire resistance method for a wiring box. FIG. 16 is a diagram for explaining a fire resistance method for a wiring box disclosed in Japanese Patent Application Laid-Open No. 2007-14045. To prevent fire spread from the wiring box, fireproof measures are taken at the connector. That is, as shown in FIG. 16, in a state where the connector 120 is fixed to the wiring box 110, the entire protruding portion 123 and nut portion 125 of the connector 120 in the inner space of the wiring box 110 are formed with a predetermined thickness and foamed. It is covered with an adhesive plastic material 130.
Japanese Patent No. 2945272 JP 2003-41683 A JP 2007-14045 A

  In the method disclosed in Patent Document 3, in a wiring box in which wiring is actually performed, when a considerable amount of electric wires (flammable long objects) are packed inside, an opening for attaching the wiring box is wired. It is smaller than the box, and it may be difficult to take refractory measures by putting your hands inside. Also, with this method, the connector is filled with refractory material, but there is a movement to pull or push the wire (flammable long object) that passes through the connector when actually attaching the switch and outlet to the wiring box. There is a risk that the foaming adhesive plastic material filled at that time may be displaced.

  Moreover, in such a refractory construction method, in order to exhibit sufficient performance, it is necessary to take measures that can be confirmed after the construction to confirm whether or not the correct construction is being performed. In the case of construction to a wiring box, if the construction part is inside a wall or the like, it is difficult to confirm after construction, and it may not be possible to determine whether or not correct construction has been performed. In general, measures have been taken to put a construction completion label or the like on the construction department, but there is a case where a deviation occurs due to the judgment of the construction person and it is not certain. Therefore, it is desirable that a third party can visually recognize that the construction is correctly performed after the construction.

  Therefore, in view of the above problems, the object of the present invention is not affected by construction techniques and processes related to installation of switches, outlets, etc., and a flexible conduit connector and flexible conduit in the event of a fire. An object of the present invention is to provide a fireproofing member for a wiring box that can reliably prevent the spread of fire.

  The inventor has intensively studied to solve the above-mentioned conventional problems. As a result, the flexible conduit tube and the flexible conduit connector attached to the wiring box, particularly the connector portion, have a predetermined cross-sectional shape (for example, a U-shape, a polygon, If the holding member is attached to the wiring box by covering it from the outside with a circular) holding member, in the event of a fire, the thermally expandable refractory material expands in the holding member and crushes the connector, closing the connector mounting hole in the wiring box Thus, it has been found that the spread of fire to the flexible conduit can be reliably prevented. Further, it has been found that if the attachment of the holding member to the wiring box is made visible from the opening, it can be easily confirmed that the holding member provided with the heat-expandable refractory material has been reliably applied. The present invention has been made based on the research results described above.

  A first aspect of the fireproofing member for a wiring box according to the present invention includes a claw portion attached to an outer end portion of the wiring box, and a holding member having a predetermined strength, width, and cross-sectional shape; It is the fireproofing member for wiring boxes provided with the thermally expansible fireproof material arrange | positioned.

  According to a second aspect of the fireproofing member for a wiring box of the present invention, the holding member is formed by extending the main body, a bent portion formed at one end of the main body, and the bent portion. It is a fireproofing member for a wiring box, which consists of a claw portion.

  A third aspect of the fireproofing member for a wiring box according to the present invention is a fireproofing member for a wiring box, wherein the bent portion is formed of a pair of bent portions and is bent to the outside of the main body.

  A fourth aspect of the fireproofing member for a wiring box according to the present invention is a fireproofing member for a wiring box, wherein the bent portion is formed of a pair of bent portions and is bent to the inside of the main body.

  A fifth aspect of the fireproofing member for a wiring box according to the present invention is a fireproofing member for a wiring box in which a pair of claw portions extend along the width direction of the main body.

  According to a sixth aspect of the fireproofing member for a wiring box of the present invention, the main body has the width so as to cover a flexible conduit fitting connector attached to the wiring box from the outside, and the predetermined body This is a fireproofing member for a wiring box, which has such a strength that the heat-expandable refractory material can support expansion inside the main body when the strength of the heat-resistant material reaches a predetermined temperature or higher.

  According to a seventh aspect of the fireproofing member for a wiring box of the present invention, the thermally expandable refractory material is thermally expanded at a temperature equal to or higher than the predetermined temperature, and crushes the flexible conduit fitting connector. This is a fireproofing member for a wiring box that closes the connector mounting hole and prevents fire spread to the flexible conduit.

  According to an eighth aspect of the fireproofing member for a wiring box of the present invention, the claw portion of the holding member is inserted between the fireproof board and the wiring box disposed to face the fireproof board, and the holding It is a fireproofing member for a wiring box, wherein the member is fixed to the wiring box.

  A ninth aspect of the fireproofing member for a wiring box according to the present invention is a fireproofing member for a wiring box in which the claw portion is folded into the wiring box and is visible from an opening of the wiring box. .

  A tenth aspect of the fireproofing member for a wiring box according to the present invention is a fireproofing member for a wiring box in which the holding member is provided corresponding to each of the flexible conduit tube mounting connectors.

  An eleventh aspect of the fireproofing member for a wiring box according to the present invention is a fireproofing member for a wiring box, wherein the holding member is provided so as to cover the plurality of flexible conduit tube mounting connectors.

  A first aspect of the fireproof fire wall of the present invention is a fireproof fire wall using the above-described fireproof member for a wiring box.

  In the first aspect of the fireproofing treatment method of the present invention, the above-described fireproofing member for a wiring box and a portion where the flexible conduit passes through the wall, a thermally expandable refractory material is disposed inside the half cracked tube, It is a fireproofing treatment method for preventing the flexible conduit tube from spreading by combining the half cracked tubes facing each other.

  According to this invention, it is possible to improve the fireproof performance of the place where the wiring box is installed. In addition, workability is good, and it is not affected by the installer's technology or the process related to the installation of switches and outlets. Moreover, since it is attached to the outside of the wiring box, it does not hinder internal wiring work, etc., and this fireproof measure is not affected by the attachment. In the event of a fire, the heat-expandable refractory material inside the bracket expands to block heat and flame from inside and outside the wiring box. Therefore, it is possible to reliably prevent the spread of fire through the wiring box.

A fireproof member for a wiring box according to the present invention will be described with reference to the drawings.
One aspect of the fireproofing member for a wiring box according to the present invention includes a claw portion attached to the outer end of the wiring box, has a predetermined strength, and has a predetermined cross section (for example, a generally U-shaped, polygonal, It is a fireproofing member for a wiring box provided with a holding member having a predetermined width such as a circular shape and a thermally expandable refractory material disposed inside the holding member. The holding member described above includes a main body, a bent portion formed at one end portion of the main body, and a claw portion formed by extending from the bent portion.

  FIG. 1 is a view for explaining one aspect of a fireproofing member for a wiring box according to the present invention. 1A is a perspective view, FIG. 1B is a plan view seen from the claw side, FIG. 1C is a side view, and FIG. 1D is a front view. As shown in FIG. 1, the fireproofing member 1 for a wiring box includes a holding member 2 and a thermally expandable refractory material 6 disposed inside the holding member 2. The holding member 2 includes a main body 3 having a substantially U-shaped cross section, a bent portion 4 formed integrally by bending at a lower end portion of one end portion of the main body, and a bent portion 4 that is bent in another direction. And a claw portion 5 that is formed automatically. Moreover, the holding member 2 is good also as shapes, such as a polygon and a circle, depending on attachment object.

  The width | variety of the main body 3 is a magnitude | size which can cover the connector for flexible conduit attachment attached to a wiring box from the outside. As shown in FIG. 1A, the bent portion 4 and the claw portion 5 each consist of a pair. In the embodiment shown in FIG. 1, the bent portion 4 is formed by being bent outside the main body 3. The claw portion 5 is formed by being bent and extending downward along the width direction of the end portion of the main body 3.

The strength of the holding member 2 having a substantially U-shaped cross section (polygonal or circular depending on the mounting target) is expanded by heat, for example, in the form of a sheet-like heat-expandable refractory material 6 arranged inside the main body 3, When the flexible conduit fitting connector attached to the wiring box is crushed, it must be large enough to hold the expanded refractory material in the main body 3. As a result, the connector mounting hole of the wiring box can be closed, and the fire spread to the flexible conduit can be reliably prevented.
The nail | claw part 5 of the holding member 2 is inserted between a fireproof board and the wiring box arrange | positioned facing a fireproof board, and a holding member is fixed to a wiring box.

  FIG. 2 is a diagram illustrating another embodiment of the fireproofing member for a wiring box according to the present invention. 2A is a perspective view, FIG. 2B is a plan view seen from the claw side, FIG. 2C is a side view, and FIG. 2D is a front view. As shown in FIG. 2, also in this aspect, the fireproofing member 1 for a wiring box includes a holding member 2 and a thermally expandable refractory material 6 disposed inside the holding member 2. The holding member 2 includes a main body 3 having a substantially U-shaped cross section, a bent portion 4 formed integrally by bending at a lower end portion of one end portion of the main body, and a bent portion 4 that is bent in another direction. And a claw portion 5 that is formed automatically.

  The aspect shown in FIG. 2 is different from the aspect shown in FIG. 1 in that the bent portion 4 is formed by being bent inside the main body 3. A claw portion is formed by further bending from a bent portion 4 formed by bending inside the main body 3. Also in this aspect, the claw portion 5 is formed by extending downward along the width direction of the end portion of the main body 3. Moreover, the shape of the nail | claw part can also make the cross section into a polygon and circular.

  In addition, in the aspect mentioned above, although the holding member 2 is provided with the bending part 4, the nail | claw part may be integrally formed from the main body, without providing a bending part. That is, the fireproofing member 1 for a wiring box includes a holding member 2 and a thermally expandable refractory material 6 disposed inside the holding member 2, and the holding member 2 is formed directly on the main body and the main body. Provided with a claw portion.

  FIG. 3 is a schematic cross-sectional view illustrating a state in which the fireproof member for a wiring box of the present invention is attached to the wiring box. FIG. 4 is a diagram for explaining the situation of a conventional wiring box. As shown in FIG. 3 and FIG. 4, there is a hollow wall 8 configured by sticking a fireproof board 7 such as a gypsum board on both sides of a support made of a lightweight steel frame. A wiring box 9 is installed inside the hollow wall 8, and an opening 14 is provided facing the front surface of the wiring box 9.

  A plate 15 including a switch and an outlet 16 is attached to the opening 14 from the outside of the hollow wall 8 so as to close the opening. A flexible conduit 11 (flammable long object) is connected to the wiring box 9 by a connector 10. An electric wire 12 (flammable long object) is passed through the flexible conduit 11, and an end of the electric wire 12 is drawn into the wiring box 9 and connected to a switch and an outlet 16.

The wiring box 9 is fixed to the support fitting 13 with bolts and nuts. The support metal fitting 13 is attached to a lightweight steel frame, which will be described later, so that the wiring box 9 faces the opening. In the conventional state shown in FIG. 4, that is, when fireproof measures are not taken, since the resin parts are frequently used for the switch and outlet 16 of the opening 14, in the event of a fire, it is burned at an early stage, and the wiring box Heat and flame flow into 9. Thereafter, the connector 10 and the flexible conduit 11 (flammable long article) attached to the wiring box 9 are combusted, the connector 10 and the flexible conduit 11 are melted and combusted, and spread through the hollow wall. Expands.
In this invention, the fireproofing member 1 for wiring boxes is attached to the conventional wiring box shown in FIG. 4 so as to cover the connector 10.

  FIG. 5 is a partially enlarged view for explaining a situation where the wiring box fireproofing member 1 is attached to the wiring box. As shown in FIG. 5, a wiring box 9 is attached facing the opening 14 of the fireproof board 7. The claw portion 5 of the fireproofing member 1 for a wiring box according to the present invention described with reference to FIG. 1 or FIG. 2 is inserted between the fireproof board 7 and the wiring box 9 attached in this manner, and preferably a tip portion. Is bent and fixed.

  That is, the main body 3 of the holding member 2 is arranged so as to cover the flexible conduit connector 10 attached to the wiring box 9 from the outside. The holding member 2 is attached from the outside of the wiring box 9 so that one end thereof is in contact with the wiring box 9 and, as described above, the claw portion 5 is inserted between the fireproof board 7 and the wiring box 9 and fixed. .

  In the embodiment shown in FIG. 3, the flexible conduit 11 and the connector 10 are respectively attached to the upper and lower sides of the wiring box, and the wiring box 9 covers the connector 10 as described with reference to FIG. The fireproofing member 1 for a wiring box is attached to and fixed. Therefore, in the event of a fire, the thermally expandable refractory material placed in the holding member above and below the wiring box expands in the holding member, crushes the connector 10 and closes the connector mounting hole of the wiring box. To prevent fire spread to the flexible conduit.

  FIG. 6 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box of the present invention attached to the wiring box. That is, FIG. 6 is a view of the wiring box disposed in the hollow wall formed by the fireproof board 7 as seen from the longitudinal direction of the flexible conduit. To facilitate understanding of the present invention, FIG. 8 is shown. FIG. 8 shows a conventional wiring box. In FIG. 8, the fireproof member for the wiring box of the present invention shown in FIG. 6 is not attached. Others are the same as FIG.

  As shown in FIG. 6, a wiring box 9 is attached facing an opening 14 in a hollow wall 8 formed by sticking a fireproof board 7 such as a plaster board on both sides of a support column 17 made of a lightweight steel frame. . The opening 14 is closed from the outside of the hollow wall 8 by a plate 15 having a switch and an outlet 16. The wiring box 9 is fixed to the support fitting 13 with bolts and nuts. The support fitting 13 is attached to the lightweight steel frame 17 so that the wiring box 9 faces the opening 14.

  In the embodiment shown in FIG. 6, two flexible conduits are connected to the wiring box 9 via a connector 10. As described with reference to FIG. 5, each of the two connectors has the wiring box fire-resistant treatment member 1 including the holding member 2 and the thermally expandable fire-resistant material 6 disposed inside the holding member 2. Are attached to the wiring box 9. Similarly, on the opposite side shown in FIG. 6, a fireproofing member 1 for a wiring box comprising a holding member 2 and a thermally expandable refractory material 6 disposed inside the holding member 2 for each of the two connectors. Is attached to the wiring box 9.

  Therefore, in the event of a fire, the heat-expandable refractory material expands due to the heat of the fire, and completely clogs the internal connector and flexible conduit, completely closing the space between the wiring box and the flexible conduit. Can reliably prevent the fire from spreading to a flexible conduit. The holding member may be attached to each connector, or may be attached so as to cover a plurality of connectors together. When the connector is attached to 6 knockouts as shown in FIG. 13 to be described later, the 6 covers are collectively covered with a single bracket, the 5 covers are covered with 1 piece, and the 4 are connected with 2 pieces. It is good also as a shape covered with 3, 3 pieces, a shape covered with 2, 3 pieces, a shape covered with 2 pieces, 2 pieces, 2 pieces, 3 pieces, 2 pieces, 1 piece. There are no restrictions on the way the connectors are arranged, and they can be arranged in combinations that are easy to install. Similarly, it is possible to construct a box with 5 or fewer knockouts using a combination of connectors. Even when the holding members are attached to the connectors one by one, if the fixing claw portions are folded inside the holding member, they can be attached side by side without any problem even when the gap between the connectors is small.

  FIG. 7 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box of the present invention attached to the wiring box. That is, FIG. 7 is a view of the wiring box disposed in the hollow wall formed by the fireproof board 7 as seen from the longitudinal direction of the flexible conduit as in FIG. The mode shown in FIG. 7 is different from the mode shown in FIG. 6 in the way of attaching the fireproofing member for the wiring box. That is, in the embodiment shown in FIG. 6, each of the two connectors attached to the wiring box is provided with a holding member 2 and a heat-expandable refractory material 6 disposed inside the holding member 2. The processing member 1 is attached to the wiring box 9 as described with reference to FIG.

  On the other hand, in the embodiment shown in FIG. 7, two connectors attached to the wiring box (not limited to two but may be a plurality of three, etc.) are covered from the outside by one wiring box fireproofing member. Yes. Others are the same as the aspect shown in FIG. Also in this case, in the event of a fire, the heat-expandable refractory material attached to the inside of the holding member expands due to the heat of the fire, crushing the connector and flexible conduit (flammable long material), and wiring box And the flexible conduit. Thereby, inflow of heat and flame into the hollow wall can be prevented, and fire spread can be prevented.

  FIG. 9 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box of the present invention attached to the wiring box. That is, FIG. 9 is a view of the wiring box 9 arranged in the hollow wall 8 formed by the fireproof board 7 as seen from the longitudinal direction of the flexible conduit, as in FIG. The mode shown in FIG. 9 is different from the mode shown in FIG. 7 in how to attach the fireproof member 1 for wiring box. That is, in the aspect shown in FIG. 7, the two connectors 10 attached to the wiring box 9 are covered from the outside by the one holding member 2 in which one heat-expandable refractory material 6 is arranged inside.

  On the other hand, in the embodiment shown in FIG. 9, the two connectors 10 attached to the wiring box 9 are each covered with one thermal expandable refractory material 6 and the whole is covered with one holding member 2. This aspect is suitable, for example, when the holding member 2 is relatively large and the volume of the portion where the connector 10 is disposed is large. In this way, the heat-expandable refractory material 6 is arranged so as to cover the individual connectors, and the whole is supported by one holding member, so that in the event of a fire, the heat attached to the inside of the holding member due to the heat of the fire. The inflatable refractory material expands and crushes the connector and the flexible conduit and reliably closes the space between the wiring box and the flexible conduit. Thereby, inflow of heat and flame into the hollow wall can be prevented, and fire spread can be prevented.

  FIG. 10 is a schematic cross-sectional view illustrating a state in which the wiring box fireproofing member according to one aspect of the present invention is attached to the wiring box. A difference from the aspect described with reference to FIG. 3 is that the heat resistant sealing material 18 is attached to the outside of the wiring box 9 in the aspect shown in FIG. Others are the same as the aspect demonstrated with reference to FIG. By covering the outside of the wiring box 9 with the heat-resistant sealing material 18 in this way, higher fire resistance can be obtained. Furthermore, it is possible to provide sound insulation performance and fire resistance performance by using a material with high specific gravity.

  FIG. 11 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box of the present invention attached to a wiring box whose outer side is covered with a heat-resistant sealing material. The mode shown in FIG. 11 corresponds to the mode described with reference to FIG. That is, in FIG. 11, the embodiment is the same as that described with reference to FIG. 6 except that the outside of the wiring box 9 is covered with the heat-resistant sealing material 18. In other words, in this embodiment, each of the two connectors 10 has a wiring box fireproofing treatment member 1 comprising a holding member 2 and a thermally expandable fireproofing material 6 arranged inside the holding member 2 as shown in FIG. As described with reference, it is attached to the wiring box 9.

  FIG. 12 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box according to the present invention, which is attached to a wiring box whose outside is covered with a heat-resistant sealing material. The mode shown in FIG. 12 corresponds to the mode described with reference to FIG. That is, in FIG. 12, it is the same as that described with reference to FIG. 9 except that the outside of the wiring box 9 is covered with the heat-resistant sealing material 18. In other words, in this embodiment, the two connectors 10 attached to the wiring box 9 are each covered with one thermal expansion refractory material 6 and the whole is covered with one holding member 2.

  FIG. 13 is a cross-sectional view illustrating another embodiment of the fireproofing member for a wiring box of the present invention attached to the wiring box. In the embodiment shown in FIG. 13, three, two, and one of the six connectors 10 attached to the wiring box 9 are covered with wiring box fireproofing members. Others are the same as other aspects.

FIG. 14 is a cross-sectional view for explaining one embodiment of the fire prevention processing method of the present invention. The fireproofing method shown in FIG. 14 attaches a fireproofing member for a wiring box to the wiring box as described above, and, on the other hand, a heat-expandable fireproofing inside the half-cracked tube at a portion where the flexible conduit passes through the wall. This is a fire treatment method in which materials are arranged and the half-cracked tubes are combined in opposition. That is, as explained in the various aspects described above, in the region A, the main body 3 of the holding member 2 is arranged so as to cover the flexible conduit connector 10 attached to the wiring box 9 from the outside. In the region B, where the wiring box is not disposed, that is, in the portion where the flexible conduit passes through the wall, for example, a thermally expandable refractory material inside the half-split tube divided into two cylindrical shapes And a member in which the half cracked tubes are opposed to each other is arranged between the cable and the through hole provided in the wall. By combining the two in this way, fire prevention treatment can be performed on both walls, so a more excellent effect can be obtained.
In addition, as a half crack member, Furukawa techno material: Petitoku (brand name) etc. can be used, for example.

  In any of the above cases, in the event of a fire, while the heat resistance performance of the wiring box is further improved, the heat-expandable refractory material attached to the inside of the holding member expands due to the heat of the fire, and the connector and flexible conduit Is crushed to securely close the space between the wiring box and the flexible conduit. Thereby, inflow of heat and flame into the hollow wall can be prevented, and fire spread can be prevented.

  As described above, in the present invention, a flexible conduit connector attached to a wiring box and a side surface of the flexible conduit at a place where the wiring box is installed on a wall, ceiling, or floor composed of a fireproof board or the like. Is attached to the wiring box body so as to cover from the outside of the wiring box.

  When the construction part of the wiring box is exposed to a fire flame, it is punched to install a flexible conduit tube and an opening provided for attaching a switch and an outlet to a fireproof board as a fire spreading route. The opening of the knockout part can be considered. In the event of a fire, if either of these can be completely blocked, it is possible to prevent the spread of fire through the wiring box.

Compared to an opening provided in a fireproof board or the like, the punched-out knockout opening has a small area and is considered to be easily and reliably closed. For this reason, in the present invention, a method for closing the punched-out knockout opening was selected as the fireproofing treatment.
Further, in the conventional method, the construction is performed from the inside of the wiring box. However, by changing the construction to the construction from the outside of the wiring box, the internal space is not compressed, so that the internal work is not hindered.

  Further, the holding member is formed to have a size corresponding to the depth of the wiring box, and there are two types, that is, a deep wiring box for a deep depth and a shallow wiring box for a shallow depth. By forming the bent part of the holding member on the outside or the inside, regardless of the number of knockouts of the wiring box, it is possible to use the deep box for the knockout part of all deep boxes, and for the shallow box. It can be used for the knockout part of all shallow boxes.

  Also, in the event of a fire, the heat-expandable refractory material expanded by the heat of the flame is held by the holding member fixed to the wiring box by the claw portion, so it may collapse or fall from the state held by the holding member. Be blocked. Therefore, long-term fire resistance can be ensured. If the flat cover is connected to the wiring box, insert the claw into the gap between the fireproof board and the wiring box. It is possible to fix the holding member to the wiring box by bending it into the wiring box.

  As described above, by fixing, the fireproofing member for a wiring box of the present invention can correspond to all of the knockout portions provided on the side surface of the wiring box. Even if the side and bottom connectors and flexible conduits (flammable long objects) burn out in the event of a fire by being firmly fixed to the wiring box, It is possible to hold a thermally expandable refractory material that has expanded in order to block fire flames or heat. The heat-expandable refractory material attached to the inside of the holding member can be applied as it is in the state of being attached to the holding member as long as it is a sheet, but after attaching the holding member, the holding member, the connector, and the flexible conduit (flammable length) You may fill the space | gap of a scale) with a heat-expandable putty.

The fireproof member for a wiring box according to the present invention can be constructed by confirming the inside of the wiring box even if it is constructed outside the wiring box by folding the claw part of the holding member into the wiring box at the time of construction. It is possible to confirm whether or not it is being performed. For this reason, even if it is installed in the wall, the fireproof member for the wiring box of the present invention is correctly installed by removing the cover such as the outlet and the switch and checking the inside without removing the wall. It is possible to confirm whether or not Moreover, in order to improve visibility, you may paint the color of a nail | claw part in the color which is easy to visually recognize, such as red. When it is used in a dark part, it can be surface-treated so as to reflect light well.
In addition, as a thermal expansion refractory material mentioned above, the material which has graphite, an expanded graphite, etc. as a main component is mentioned. A metal is preferable as the holding member, but any material having heat resistance and strength can be applied. In this invention, although the case where the switch, the outlet, and the like are provided in the wiring box has been described, the present invention is not limited thereto, and can be applied to a wiring box that is arranged on the ceiling or the like and simply connects the conduit. .

  According to this invention, it is not affected by the construction technology and processes related to the installation of switches and outlets, and in the event of a fire, the flexible conduit connector and the wiring that can reliably prevent the fire from spreading to the flexible conduit Providing fireproof materials for boxes.

FIG. 1 is a view for explaining one aspect of a fireproofing member for a wiring box according to the present invention. 1A is a perspective view, FIG. 1B is a plan view seen from the claw side, FIG. 1C is a side view, and FIG. 1D is a front view. FIG. 2 is a diagram illustrating another embodiment of the fireproofing member for a wiring box according to the present invention. 2A is a perspective view, FIG. 2B is a plan view seen from the claw side, FIG. 2C is a side view, and FIG. 2D is a front view. FIG. 3 is a schematic cross-sectional view illustrating a state in which the fireproof member for a wiring box of the present invention is attached to the wiring box. FIG. 4 is a diagram for explaining the situation of a conventional wiring box. FIG. 5 is a partially enlarged view for explaining a situation where the wiring box fireproofing member 1 is attached to the wiring box. FIG. 6 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box of the present invention attached to the wiring box. FIG. 7 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box of the present invention attached to the wiring box. FIG. 8 shows a conventional wiring box. FIG. 9 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box of the present invention attached to the wiring box. FIG. 10 is a schematic cross-sectional view illustrating a state in which the wiring box fireproofing member according to one aspect of the present invention is attached to the wiring box. FIG. 11 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box of the present invention attached to a wiring box whose outer side is covered with a heat-resistant sealing material. FIG. 12 is a cross-sectional view illustrating another aspect of the fireproofing member for a wiring box according to the present invention, which is attached to a wiring box whose outside is covered with a heat-resistant sealing material. FIG. 13 is a cross-sectional view illustrating another embodiment of the fireproofing member for a wiring box of the present invention attached to the wiring box. FIG. 14 is a cross-sectional view for explaining one embodiment of the fire prevention processing method of the present invention. FIG. 15 is a diagram for explaining a conventional fireproofing method for a wiring box. FIG. 16 is a diagram for explaining a conventional fireproofing method for a wiring box.

Explanation of symbols

1 Fireproof member for wiring box of the present invention
2 Holding member 3 U-shaped body 4 Bent part 5 Claw part 6 Thermally expansible fireproof material 7 Fireproof board 8 Hollow wall 9 Wiring box 10 Connector 11 Flexible conduit 12 Electric wire 13 Support metal fitting 14 Opening 15 Plate 16 Outlet 17 Post 18 Heat-resistant sealing material

Claims (13)

  A fireproof for a wiring box comprising a holding member having a predetermined strength, width and cross-sectional shape, and a thermally expandable refractory material disposed inside the holding member, having a claw portion attached to the outer end of the wiring box Processing member.   The wiring box according to claim 1, wherein the holding member includes a main body, a bent portion formed at one end of the main body, and the claw portion formed by extending from the bent portion. Refractory material.   The fireproofing member for a wiring box according to claim 2, wherein the bent portion is formed of a pair of bent portions and is bent to the outside of the main body.   The fireproof member for a wiring box according to claim 2, wherein the bent portion is formed of a pair of bent portions and is bent to the inside of the main body.   The fireproofing member for a wiring box according to claim 3 or 4, wherein the pair of claws extend along the width direction of the main body.   The main body is provided with the width so as to cover a flexible conduit mounting connector attached to the wiring box from the outside, and when the predetermined strength of the main body exceeds a predetermined temperature, the thermally expandable refractory material is The fireproofing member for a wiring box according to any one of claims 2 to 5, which has a strength capable of supporting expansion inside the main body.   The thermally expandable refractory material is thermally expanded at a temperature equal to or higher than the predetermined temperature, crushes the flexible conduit tube mounting connector, closes the connector mounting hole of the wiring box, and spreads to the flexible conduit tube. The fireproofing member for a wiring box according to claim 6, wherein   The holding member is fixed to the wiring box by inserting the claw portion of the holding member between the fireproof board and the wiring box disposed to face the fireproof board. The fireproofing member for wiring boxes of any one of Claims.   The fireproofing member for a wiring box according to claim 8, wherein the claw portion is folded into the wiring box and is visible from an opening of the wiring box.   The fireproofing member for a wiring box according to any one of claims 6 to 9, wherein the holding member is provided corresponding to each of the flexible conduit fitting connectors.   The fireproof member for a wiring box according to any one of claims 6 to 9, wherein the holding member is provided so as to cover the plurality of connectors for attaching the flexible conduit tube.   A fireproof fire barrier using the fireproofing member for a wiring box according to claim 1.   A fire-resistant treatment member for a wiring box according to claim 1 and a portion where the flexible conduit passes through the wall, and a thermally expandable refractory material is disposed inside the half-cracked tube, and faces the half-cracked tube. A fireproofing method that prevents the flexible conduit tube from spreading by combining them together.

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